Add predictions_worker service to docker_compose.yml
Add predictions_worker service to docker_compose.yml

Requires /pred_data/models directory exist on host with .model and tracks.yaml
Also mounts /pred_data/work as a working directory to be shared between worker and cwl tasks

Duke-GCB/TF-DNA-PredictionsDB,Duke-GCB/iMADS,Duke-GCB/iMADS,Duke-GCB/TF-DNA-PredictionsDB,Duke-GCB/iMADS,Duke-GCB/TF-DNA-PredictionsDB,Duke-GCB/TF-DNA-PredictionsDB,Duke-GCB/iMADS